CN201682186U - Portable sleeve oil supply machine - Google Patents
Portable sleeve oil supply machine Download PDFInfo
- Publication number
- CN201682186U CN201682186U CN2010201370484U CN201020137048U CN201682186U CN 201682186 U CN201682186 U CN 201682186U CN 2010201370484 U CN2010201370484 U CN 2010201370484U CN 201020137048 U CN201020137048 U CN 201020137048U CN 201682186 U CN201682186 U CN 201682186U
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- oil
- repairing
- operated valve
- electromagnetically operated
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Abstract
The utility model belongs to a sleeve oil supply device, and particularly relates to a portable sleeve oil supply machine for realizing convenient, non-air bubble and high-insulation vacuum oil supply of a transformer sleeve by adopting a singlechip control technique. The portable sleeve oil supply machine comprises an oil supply system, a vacuum pumping system, a transition joint assembly and a singlechip control system. The portable sleeve oil supply machine has the advantages of automatically carrying out the processes of oil supply, oil product heating, degasification, vacuum pumping for dehydration and degasification, flow measurement, water and impurity filtration, pressure-protection oil supply and vacuum keep.
Description
Technical field
The utility model belongs to the sleeve pipe recharging oil device, is specifically related to a kind of portable sleeve pipe oil supply machine that adopts single-chip microcomputer control technology to realize easy, the no bubble of bushing shell for transformer, the repairing of high insulation vacuum.
Background technology
Bushing shell for transformer is an equipment important in the electric power system, by it the inner high and low pressure of transformer is guided to the fuel tank outside, it is not only as the lead-in wire insulation against ground, and the effect of undertaking anchor leg, in service at transformer, bushing shell for transformer by load current, is one of transformer current-carrying element for a long time.110KV and above sleeve pipe that electric power system is at present used all adopt the hermetically sealed electric capacity formula sleeve pipe that is filled with transformer oil.Insulating oil is as dielectric, in its grease chamber the quality of oil, oil mass whether meet the requirements and the degree of fouling of sleeve surface is directly connected to the safety of sleeve pipe security of operation and power equipment.Behind the dirty absorption moisture of sleeve surface, insulation resistance is reduced, flashover takes place easily, cause tripping operation.Simultaneously, also may make the insulating sleeve heating and cause porcelain to damage, even puncture, cause the accident because of leakage current increases.
Electric power system is in order to ensure the safe and reliable operation of bushing shell for transformer and electric power system, whether must in time understand and grasp operating bushing shell for transformer state good, especially whether the insulation level of oil meets the requirements in the bushing shell for transformer grease chamber, periodically bushing shell for transformer is recovered the oil that sample detects and safeguard with regard to needs, this will cause the bushing shell for transformer oil level on the low side, need carry out the oil level adjustment by repairing.Simultaneously,,, need from the grease chamber, emit SI semi-insulation oil, and when lowering the temperature, mend SI semi-insulation oil again to winter in summer because summer in the winter temperature difference is big at the part northern area.Also have some bushings shell for transformer also to need maintenance and repairing because of the crackle oil impregnate appears in cause for quality.
Bushing shell for transformer grease chamber insulating oil replenishes at present, generally be to adopt methods such as traditional artificial needle tubing injection, manual piston-type rammer pump and nitrogen are pressed into, directly carry out artificial repairing from sleeve pipe top hydraulic fluid port, these several repairing modes not only mix small suspension bubble and micro-moisture easily in oil, between bushing shell for transformer screen residual air, because of residual air causes oil level distortion, dirty sleeve surface, and add that speed oil is slow, oil quality is subjected to that the crude oil quality influence is big, in the refueling process air can to enter in the sleeve pipe labour intensity big and dangerous.Nitrogen plunging equipment is many and volume is big, can reduce along with the oil mass that adds increases vacuum degree.
Summary of the invention
The purpose of this utility model is to overcome deficiency of the prior art; provide a kind of by Single-chip Controlling; can carry out fuel feeding, oil product automatically and heat, outgas, vacuumize except that water degassing, flow measurement, drainage filter impurity, pressure protect repairing and vacuum degree keep the portable sleeve pipe oil supply machine of process.
The purpose of this utility model is achieved in that and comprises oil-supplementing system, pumped vacuum systems, transition joint assembly and single-chip computer control system, a, oil-supplementing system comprises fuel tank, fuel tank internal is equipped with installs atomizer and quantitative oil pump, the oil-in of atomizer by flexible pipe successively with transformer oil degassing separator, temperature sensor, quartzy transient state heater, frequency conversion is from oil scavenge pump, the oil-feed electromagnetically operated valve, the oil-feed quick connector with treat that the repairing product link to each other, the oil-in of quantitative oil pump is by flexible pipe flow totalizer successively, combination filter, pressure sensor, the repairing electromagnetically operated valve, the repairing quick connector links to each other with the outspoken connection-peg of repairing; Described frequency conversion is controlled by frequency-variable controller from oil scavenge pump; Power supply links to each other from oil scavenge pump, oil-feed electromagnetically operated valve, repairing electromagnetically operated valve with quantitative oil pump, quartzy transient state heater, frequency conversion respectively; B, pumped vacuum systems comprise vacuum pump, vacuum pump by flexible pipe successively with vacuumize electromagnetically operated valve, gs-oil separator, fuel tank, return-air electromagnetically operated valve, the return-air quick connector links to each other with the outspoken connection-peg of return-air, vacuum transducer is installed on the top of fuel tank; Described gs-oil separator is fixed in the top of fuel tank; Power supply respectively with vacuum pump, vacuumize electromagnetically operated valve, the return-air electromagnetically operated valve links to each other; C, transition joint assembly comprise repairing cavity and return-air cavity, the repairing cavity by the transition joint that links to each other with sleeve pipe by with jointing, oil inlet pipe and the outspoken connection-peg of the repairing formation that links to each other with the repairing quick connector; The return-air cavity is by muffler, the oil inlet pipe formation that links to each other with the outspoken connection-peg of return-air; D, single-chip computer control system comprise that Single Chip Microcomputer (SCM) system, Single Chip Microcomputer (SCM) system are installed in the rear side of liquid crystal display screen panel of living in, Single Chip Microcomputer (SCM) system respectively with oil-feed electromagnetically operated valve, return-air electromagnetically operated valve, repairing electromagnetically operated valve, frequency-variable controller, temperature sensor, vacuumize electromagnetically operated valve, vacuum pump, vacuum transducer, be installed on liquid level gauge, quantitative oil pump, flow totalizer, pressure sensor in the fuel tank, keyboard links to each other with liquid crystal display screen; Single Chip Microcomputer (SCM) system links to each other with power supply.Described oil-feed electromagnetically operated valve, repairing electromagnetically operated valve, return-air electromagnetically operated valve, frequency conversion from oil scavenge pump, quartzy transient state heater, temperature sensor, the transformer oil degassing separator, flow totalizer, fuel tank, combination filter, pressure sensor, gs-oil separator, vacuum transducer, vacuum pump, vacuumize electromagnetically operated valve and be installed in the main case.Described liquid crystal display screen, keyboard, repairing quick connector, return-air quick connector and oil-feed quick connector are installed on the panel.Described flexible pipe is a transparent hose.
The utility model has following advantage:
1, the utility model adopts advanced single-chip microcomputer control technology, dispose heater, high accuracy filter core, import high-efficiency vacuum pump, adopt three-dimensional flash evaporation technology, can effectively remove transformer well cuts, moisture content and gas, thereby improve the insulation level of transformer oil in the bushing shell for transformer.
2, the utility model is equipped with pumped vacuum systems, before repairing begins, sleeve pipe is vacuumized, can check whether sleeve pipe has crackle, and overflow the gas in original oil product in the sleeve pipe, when repairing, make to remain high vacuum in the bushing shell for transformer, avoid effectively entering between bushing shell for transformer screen that air produces partial discharge or insulating barrier is breakdown.
3, the utility model adopts totally enclosed type repairing structure, and to the bushing shell for transformer repairing, guaranteeing does not have suave, no run, drip, leak phenomenon in the repairing process by continuous closed conduit, does not increase bushing shell for transformer surface degree of fouling, the generation of minimizing accident.
4, the utility model adopts the transition joint assembly, by transition joint, jointing, oil inlet pipe, the repairing in the sleeve pipe grease chamber of the outspoken connection-peg of repairing, take out vacuum in the sleeve pipe grease chamber by muffler, oil inlet pipe, the outspoken connection-peg of return-air, vacuumize with repairing and carry out simultaneously, be independent of each other.
5, the utility model adopts multiple repairing mode to be provided with, and by preset in advance repairing amount, oil compensation pressure, quits work automatically with flow totalizer metering repairing amount or when reaching protection pressure, and effectively protective casing is not damaged by high pressure.
6, transition joint assembly of the present utility model is when oil level surpasses sleeve pipe top hydraulic fluid port, and oil product can be got back to the fuel tank of portable sleeve pipe oil supply machine by muffler, oil inlet pipe, the outspoken connection-peg of return-air.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Fig. 2 is a front view of the present utility model.
Fig. 3 is a transition joint component drawings of the present utility model.
Fig. 4 is a Single-chip Controlling schematic diagram of the present utility model.
Embodiment
As Fig. 1,2,3, shown in 4, the utility model comprises oil-supplementing system, pumped vacuum systems, transition joint assembly and single-chip computer control system, a, oil-supplementing system comprises fuel tank 20, fuel tank 20 inside are equipped with installs atomizer 13 and quantitative oil pump 16, the oil-in of atomizer 13 by flexible pipe successively with transformer oil degassing separator 15, temperature sensor 9, quartzy transient state heater 8, frequency conversion is from oil scavenge pump 7, oil-feed electromagnetically operated valve 1, oil-feed quick connector 2 with treat that repairing product 32 link to each other, the oil-in of quantitative oil pump 16 is by flexible pipe flow totalizer 22 successively, combination filter 21, pressure sensor 24, repairing electromagnetically operated valve 6, repairing quick connector 5 links to each other with the outspoken connection-peg 28 of repairing; Described frequency conversion is controlled by frequency-variable controller 35 from oil scavenge pump 7; Power supply 34 links to each other from oil scavenge pump 7, oil-feed electromagnetically operated valve 1, repairing electromagnetically operated valve 6 with quantitative oil pump 16, quartzy transient state heater 8, frequency conversion respectively; B, pumped vacuum systems comprise vacuum pump 23, vacuum pump 23 by flexible pipe successively with vacuumize electromagnetically operated valve 12, gs-oil separator 11, fuel tank 20, return-air electromagnetically operated valve 3, return-air quick connector 4 links to each other with the outspoken connection-peg 30 of return-air, and vacuum transducer 19 is installed on the top of fuel tank 20; Described gs-oil separator 11 is fixed in the top of fuel tank 20; Power supply 34 respectively with vacuum pump 23, vacuumize electromagnetically operated valve 12, return-air electromagnetically operated valve 3 links to each other; C, transition joint assembly comprise repairing cavity and return-air cavity, the repairing cavity by the transition joint 26 that links to each other with sleeve pipe 33 by with jointing 27, oil inlet pipe 29 and the outspoken connection-peg 28 of the repairing formation that links to each other with repairing quick connector 5; The return-air cavity is by muffler 25, oil inlet pipe 29 formation that links to each other with the outspoken connection-peg 30 of return-air; D, single-chip computer control system comprise that Single Chip Microcomputer (SCM) system 10, Single Chip Microcomputer (SCM) system 10 are installed in the rear side of liquid crystal display screen 17 panels of living in, Single Chip Microcomputer (SCM) system 10 respectively with oil-feed electromagnetically operated valve 1, return-air electromagnetically operated valve 3, repairing electromagnetically operated valve 6, frequency-variable controller 35, temperature sensor 9, vacuumize electromagnetically operated valve 12, vacuum pump 23, vacuum transducer 19, be installed on liquid level gauge 14, quantitative oil pump 16, flow totalizer 22, pressure sensor 24 in the fuel tank 20, keyboard 18 links to each other with liquid crystal display screen 17; Single Chip Microcomputer (SCM) system 10 links to each other with power supply 34.Described oil-feed electromagnetically operated valve 1, repairing electromagnetically operated valve 6, return-air electromagnetically operated valve 3, frequency conversion from oil scavenge pump 7, quartzy transient state heater 8, temperature sensor 9, the transformer oil degassing separator 15, flow totalizer 22, fuel tank 20, combination filter 21, pressure sensor 24, gs-oil separator 11, vacuum transducer 19, vacuum pump 23, vacuumize electromagnetically operated valve 12 and be installed in the main case 31.Described liquid crystal display screen 17, keyboard 18, repairing quick connector 5, return-air quick connector 4 and oil-feed quick connector 2 are installed on the panel.Described flexible pipe is a transparent hose.
Described quantitative oil pump 16, liquid level gauge 14, atomizer 13 are installed in the fuel tank 20.
Described oil-feed electromagnetically operated valve 1, repairing electromagnetically operated valve 6, return-air electromagnetically operated valve 3, frequency conversion from oil scavenge pump 7, quartzy transient state heater 8, temperature sensor 9, the transformer oil degassing separator 15, flow totalizer 22, fuel tank 20, combination filter 21, pressure sensor 24, gs-oil separator 11, vacuum transducer 19, vacuum pump 23, vacuumize electromagnetically operated valve 12 and be installed in the main case 31.
Described liquid crystal display screen 17, keyboard 18, repairing quick connector 5, return-air quick connector 4, oil-feed quick connector 2 are installed on the panel.
Described Single Chip Microcomputer (SCM) system 10 realizes the repairing overall control according to the parameter that the user is provided with by the signal of flow totalizer 22.Described flow totalizer 22 can be provided with and show at least a repairing amount.
The parameter that described Single Chip Microcomputer (SCM) system 10 is provided with according to the user, the signal feedback by pressure sensor 21 realizes the highest oil compensation pressure control of oil-supplementing system to bushing shell for transformer.Pressure sensor 21 can be provided with at least a oil compensation pressure.
Described Single Chip Microcomputer (SCM) system 10, the signal feedback by temperature sensor 9 realize that quartzy transient state heater 8 treats the heating of repairing product; Signal feedback by vacuum transducer 19 realizes the processing that vacuumizes of oil products in 23 pairs of fuel tanks of vacuum pump 20, to reach the purpose that flash distillation removes water degassing.
Described Single Chip Microcomputer (SCM) system 10 is come the delivery rate of control of conversion from oil scavenge pump 7 by the signal feedback of liquid level gauge 14, makes the interior oil level of fuel tank remain at fixed range.
Described Single Chip Microcomputer (SCM) system 10 is controlled opening/stopping of vacuum pump 23 by the signal feedback of vacuum transducer 19, makes in the fuel tank 20 and the vacuum degree in the bushing shell for transformer grease chamber remains at fixed range.
Described transition joint assembly, by transition joint 26, jointing 27, oil inlet pipe 29, the repairing in the sleeve pipe grease chamber of the outspoken connection-peg 28 of repairing, take out vacuum in the sleeve pipe grease chamber by muffler 25, oil inlet pipe 29, the outspoken connection-peg 30 of return-air, vacuumize with repairing and carry out simultaneously, be independent of each other.
When described transition joint assembly surpassed sleeve pipe top hydraulic fluid port at oil level, oil product can be got back to the fuel tank of portable sleeve pipe oil supply machine by muffler 25, oil inlet pipe 29, the outspoken connection-peg 30 of return-air.
Use operation of the present utility model is as follows:
The first step: muffler 25 and the outspoken connection-peg 30 of return-air are installed on the oil inlet pipe 29, outspoken connection-peg 28 of repairing and jointing 27 are installed on the transition joint 26, oil inlet pipe 29 is installed on the jointing 27, oil return pipe 25 passes the interstitial hole of transition joint 26, transition joint 26 is installed on the hydraulic fluid port of bushing shell for transformer top then, and the outspoken connection-peg 28 of repairing should be in vertical state.
Second step: connect respectively: the repairing quick connector 5 of sleeve pipe oil supply machine and the outspoken connection-peg 28 of repairing of transition joint assembly downside with the transparent hose that is equipped with at random; The return-air quick connector 4 of sleeve pipe oil supply machine and the outspoken connection-peg 30 of return-air on the transition joint assembly; The oil storage quick connector 2 of sleeve pipe oil supply machine with treat the repairing product.
The 3rd step: connect the working power of sleeve pipe oil supply machine, liquid crystal display screen 17 display system initial interface,
The 4th step: under initial interface,, can be provided with to oil compensation pressure, repairing amount by " setting " key.The scope that effectively is provided with of oil compensation pressure is 0.1MPa～0.4MPa; The repairing amount can be set to the following any integer value of 500L.Single Chip Microcomputer (SCM) system 10 is carried out oil pressure protection, the control of repairing amount automatically according to the parameter of cover house keeper oil supply machine setting.
The 5th step: repairing operation: by " repairing " key, liquid crystal display screen 17 status bars show " press behind the reliable connecting line and confirm ", by " affirmation " key, status bar shows " in the repairing ", and pumped vacuum systems is evacuated down to the apparatus settings value with sleeve pipe oil supply machine and inside pipe casing earlier, automatic then pressurize 2 minutes, if vacuum degree reduces always, can not keep, illustrate that sleeve pipe has crackle, need to handle.No longer reducing if vacuum degree is reduced to a certain degree, is because the gas in the inside pipe casing crude oil overflows because of high vacuum.If vacuum degree does not change, oil-supplementing system, fuel tank assembly, pumped vacuum systems begin automatically under the control of single-chip computer control system that oil product is handled, repairing work, in the repairing total amount that reaches setting or reach under the oil compensation pressure of setting and quit work automatically.
The 6th step: vacuum pumping: by " vacuum " key, the sleeve pipe oil supply machine is evacuated down to the apparatus settings value and begins pressurize inside pipe casing once more, and the dwell time is operated according to relevant criterion by operating personnel.In the process of pressurize, can begin the operation of draining the oil.
The 7th step: the operation of draining the oil: from the transition joint assembly, take off the transparent hose that connects outspoken connection-peg 28 of repairing and the outspoken connection-peg 6 of return-air respectively, separate the oil storage quick connector 2 of sleeve pipe oil supply machine and treat the repairing product, repairing quick connector 2 cancellation is put into oil drum after self-closing, once more by " repairing " key.By " stopping " key, take off all flexible pipes from the quick connector of sleeve pipe oil supply machine and put well when in transparent hose, no longer including oil vacuole.
The 8th step: take off the transition joint assembly from bushing shell for transformer top hydraulic fluid port after pressurize is finished, the seal cover of screwing on.And close sleeve pipe oil supply machine power supply, operation is finished.
The 9th step: in operating process, by " stopping " key, the sleeve pipe oil supply machine all can quit work at any time.
Claims (4)
1. a portable sleeve pipe oil supply machine comprises oil-supplementing system, pumped vacuum systems, transition joint assembly and single-chip computer control system, it is characterized in that:
A, oil-supplementing system comprises fuel tank (20), fuel tank (20) inside is equipped with installs atomizer (13) and quantitative oil pump (16), the oil-in of atomizer (13) by flexible pipe successively with transformer oil degassing separator (15), temperature sensor (9), quartzy transient state heater (8), frequency conversion is from oil scavenge pump (7), oil-feed electromagnetically operated valve (1), oil-feed quick connector (2) with treat that repairing product (32) link to each other, the oil-in of quantitative oil pump (16) is by flexible pipe flow totalizer (22) successively, combination filter (21), pressure sensor (24), repairing electromagnetically operated valve (6), repairing quick connector (5) links to each other with the outspoken connection-peg of repairing (28); Described frequency conversion is controlled by frequency-variable controller (35) from oil scavenge pump (7); Power supply (34) links to each other from oil scavenge pump (7), oil-feed electromagnetically operated valve (1), repairing electromagnetically operated valve (6) with quantitative oil pump (16), quartzy transient state heater (8), frequency conversion respectively;
B, pumped vacuum systems comprise vacuum pump (23), vacuum pump (23) by flexible pipe successively with vacuumize electromagnetically operated valve (12), gs-oil separator (11), fuel tank (20), return-air electromagnetically operated valve (3), return-air quick connector (4) links to each other with the outspoken connection-peg of return-air (30), and vacuum transducer (19) is installed on the top of fuel tank (20); Described gs-oil separator (11) is fixed in the top of fuel tank (20); Power supply (34) respectively with vacuum pump (23), vacuumize electromagnetically operated valve (12), return-air electromagnetically operated valve (3) links to each other;
C, transition joint assembly comprise repairing cavity and return-air cavity, the repairing cavity by the transition joint (26) that links to each other with sleeve pipe (33) by with jointing (27), oil inlet pipe (29) and the outspoken connection-peg of repairing (28) formation that links to each other with repairing quick connector (5); The return-air cavity is by muffler (25), oil inlet pipe (29) formation that links to each other with the outspoken connection-peg of return-air (30);
D, single-chip computer control system comprise that Single Chip Microcomputer (SCM) system (10), Single Chip Microcomputer (SCM) system (10) are installed in the rear side of liquid crystal display screen (17) panel of living in, Single Chip Microcomputer (SCM) system (10) respectively with oil-feed electromagnetically operated valve (1), return-air electromagnetically operated valve (3), repairing electromagnetically operated valve (6), frequency-variable controller (35), temperature sensor (9), vacuumize electromagnetically operated valve (12), vacuum pump (23), vacuum transducer (19), be installed on liquid level gauge (14), quantitative oil pump (16), flow totalizer (22), pressure sensor (24) in the fuel tank (20), keyboard (18) links to each other with liquid crystal display screen (17); Single Chip Microcomputer (SCM) system (10) links to each other with power supply (34).
2. portable sleeve pipe oil supply machine according to claim 1 is characterized in that: described oil-feed electromagnetically operated valve (1), repairing electromagnetically operated valve (6), return-air electromagnetically operated valve (3), frequency conversion from oil scavenge pump (7), quartzy transient state heater (8), temperature sensor (9), the transformer oil degassing separator (15), flow totalizer (22), fuel tank (20), combination filter (21), pressure sensor (24), gs-oil separator (11), vacuum transducer (19), vacuum pump (23), vacuumize electromagnetically operated valve (12) and be installed in the main case (31).
3. portable sleeve pipe oil supply machine according to claim 1 is characterized in that: described liquid crystal display screen (17), keyboard (18), repairing quick connector (5), return-air quick connector (4) and oil-feed quick connector (2) are installed on the panel.
4. portable sleeve pipe oil supply machine according to claim 1 is characterized in that: described flexible pipe is a transparent hose.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201370484U CN201682186U (en) | 2010-03-22 | 2010-03-22 | Portable sleeve oil supply machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201370484U CN201682186U (en) | 2010-03-22 | 2010-03-22 | Portable sleeve oil supply machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201682186U true CN201682186U (en) | 2010-12-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN2010201370484U Expired - Fee Related CN201682186U (en) | 2010-03-22 | 2010-03-22 | Portable sleeve oil supply machine |
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| CN (1) | CN201682186U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102969125A (en) * | 2012-12-18 | 2013-03-13 | 郑州赛奥电子股份有限公司 | Oil replenishing device for electrified electric inductor |
| CN103887724A (en) * | 2014-04-03 | 2014-06-25 | 国家电网公司 | Method and device for supplementing oil to electrified transformer sleeve pipe |
| CN104252950A (en) * | 2014-09-17 | 2014-12-31 | 国家电网公司 | Portable oil recharging device |
| CN104332872A (en) * | 2014-11-15 | 2015-02-04 | 国网河南省电力公司南阳供电公司 | Smart box-type substation |
| CN111312505A (en) * | 2020-02-28 | 2020-06-19 | 三变科技股份有限公司 | Vacuum quantitative oil injection method for transformer |
| CN112683507A (en) * | 2020-12-18 | 2021-04-20 | 陕西航空电气有限责任公司 | Portable flow test equipment of aeroengine torch electric nozzle |
-
2010
- 2010-03-22 CN CN2010201370484U patent/CN201682186U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102969125A (en) * | 2012-12-18 | 2013-03-13 | 郑州赛奥电子股份有限公司 | Oil replenishing device for electrified electric inductor |
| CN103887724A (en) * | 2014-04-03 | 2014-06-25 | 国家电网公司 | Method and device for supplementing oil to electrified transformer sleeve pipe |
| CN104252950A (en) * | 2014-09-17 | 2014-12-31 | 国家电网公司 | Portable oil recharging device |
| CN104332872A (en) * | 2014-11-15 | 2015-02-04 | 国网河南省电力公司南阳供电公司 | Smart box-type substation |
| CN111312505A (en) * | 2020-02-28 | 2020-06-19 | 三变科技股份有限公司 | Vacuum quantitative oil injection method for transformer |
| CN111312505B (en) * | 2020-02-28 | 2021-07-27 | 三变科技股份有限公司 | Vacuum quantitative oil injection method for transformer |
| CN112683507A (en) * | 2020-12-18 | 2021-04-20 | 陕西航空电气有限责任公司 | Portable flow test equipment of aeroengine torch electric nozzle |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101222 Termination date: 20180322 |
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| CF01 | Termination of patent right due to non-payment of annual fee |